Bark consumption by voles in relation to geographical origin of tree species
作者:
Lennart Hansson,
期刊:
Scandinavian Journal of Forest Research
(Taylor Available online 1994)
卷期:
Volume 9,
issue 1-4
页码: 288-296
ISSN:0282-7581
年代: 1994
DOI:10.1080/02827589409382842
出版商: Taylor & Francis Group
关键词: voles;bark damage;aspen;birch;rowan;tree origins;chemistry.
数据来源: Taylor
摘要:
Voles have caused more damage by bark consumption toPicea abiesandPinus contortaseedlings from southern than those from northern origins when planted in northern Scandinavia. In field and laboratory experiments, indigenous Scandinavian tree species from different origins and of various phenological stages were tested for susceptability to vole attacks. Seedlings from northern sites and late phenological stages were most severely attacked by both bank volesClethrionomys glareolusand field volesMicrotus agrestis,while a few aspen clones differed independently of origin. Bark consumption by the two vole species was strongly and negatively related to the concentration of crude fibre in the examined twigs. Bank voles also reacted positively to the content of nitrogen‐free extracts. Differences in preferences for seedlings from different geographical regions appear to result from differences in the bark at the end of growth and in the frost‐hardening process in autumn. Plants transferred northwards probably will not harden in a climatically appropriate way, will contain low concentration of fibre in winter, and will be a preferred food for voles.
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